Back to EveryPatent.com
United States Patent | 5,608,616 |
Umeda ,   et al. | March 4, 1997 |
A power converter for an AC generator for motor vehicles for converting a generated voltage of the AC generator driven by an engine into a DC voltage to feed to a battery includes at least either high-side MOS power transistors for connecting an output end of an armature coil which generates the generated voltage of the AC generator with a high potential end of a battery or low-side MOS power transistors for connecting the output end of the armature coil with a low potential end of the battery. The MOS power transistors each has a source region, a well region and a drain region. A high resistance connected with either a parasitic diode on the side connected with the source generated between the source region and well region or a parasitic diode on the side connected with the drain generated between the drain region and well region in parallel is formed in the MOS power transistors. Thereby, it allows blocking a reverse current produced by the parasitic diode and giving a necessary potential to the well region. Further, SiC is used in the MOS power transistors rather than Si.
Inventors: | Umeda; Atsushi (Anjo, JP); Tokura; Norihito (Okazaki, JP); Sato; Hirohide (Toyokawa, JP) |
Assignee: | Nippondenso Co., Ltd. (Kariya, JP) |
Appl. No.: | 351027 |
Filed: | December 7, 1994 |
Dec 07, 1993[JP] | 5-306782 | |
Dec 13, 1993[JP] | 5-312161 |
Current U.S. Class: | 363/132; 257/E29.104; 257/E29.143; 257/E29.257; 257/E29.26 |
Intern'l Class: | H01L 029/10 |
Field of Search: | 363/132,125,131,127,19-21,56,97 323/289,271,272,282,290,320,902 361/93,98 307/31-34 |
4985743 | Jan., 1991 | Tokura et al. | 357/39. |
5233215 | Aug., 1993 | Baliga | 257/490. |
Foreign Patent Documents | |||
3824836 | Feb., 1989 | DE. | |
61-80858 | Apr., 1986 | JP. |